Self-Regulating Fuel Injector Piston Cylinder Pressure
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Solution Overview
Problem
Existing fuel injection systems in internal combustion engines, reliant on external pumps, lack responsiveness to faulty conditions within the engine cylinder, leading to inefficient fuel usage and air pollution due to continued fuel injection even when issues like broken piston rings occur.
Innovation Solution
An injecting apparatus with a piston movable under fluid pressure, where the piston compresses fluid in a high-pressure chamber and its movement is selectively controlled by fluid pressure in a control chamber, allowing for precise injection through an injector valve and orifice, with features like solenoids and bias members to manage pressure and valve operation, enabling responsive fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If external pumps and control systems are used for fuel injection, then fuel can be supplied under sufficient pressure, but the system complexity increases and responsiveness to faulty conditions deteriorates
Solution Approach 1:
The patent combines the fuel compression function and injection control function into a single integrated injector unit. The piston mechanism that compresses fuel to high pressure is housed within the injector body itself, eliminating the need for separate external pumps and control systems while maintaining the required fuel pressure for injection
Solution Approach 2:
The injector is designed to be self-contained with the piston automatically responding to cylinder pressure conditions. When faulty conditions occur (such as broken piston rings), the system self-regulates by preventing further fuel injection without requiring external monitoring or control systems
2Ease of operation
If external control systems are used for injection timing, then injection can be controlled, but responsiveness to faulty conditions deteriorates
Solution Approach 1:
The piston mechanism directly senses cylinder pressure conditions and automatically adjusts injection timing and termination based on real-time feedback from the combustion chamber. This eliminates the lag and unresponsiveness inherent in external control systems, allowing the injector to immediately respond to faulty conditions such as broken piston rings or abnormal combustion
Solution Approach 2:
The injector monitors its own operating conditions through the piston mechanism and autonomously makes control decisions. When faulty conditions are detected, the system self-corrects by preventing further fuel injection without requiring external monitoring systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the responsiveness of fuel injection systems, reducing air pollution by preventing the injection of unburnt fuel and improving engine efficiency through precise control of fuel delivery, potentially eliminating the need for external pumping systems and exhaust after-treatment systems.
Implementation Method 1
a piston movable in the body under the action of fluid pressure in the associated chamber acting from externally against the piston
Implementation Method 2
the piston being movable against the action of fluid pressure in a control chamber whereby movement of the piston is selectively controllable by controlling the fluid in the control chamber
Data Source
AI summary
An injecting apparatus for injecting a fluid under pressure into an associated chamber, the injecting apparatus including:a body,a piston movable in the body under the action of fluid pressure in the associated chamber acting from externally against the piston, the piston being operable to compress fluid to be injected in a high pressure chamber, the piston being movable against the action of fluid pressure in a control chamber whereby movement of the piston is selectively controllable by controlling the fluid in the control chamber,an injector valve and an associated injector orifice in selective fluid communication with the high pressure chamber whereby high pressure fluid from the high pressure chamber can be injected through the injector orifice upon opening of the injection valve.